Abrading machine



May'29, 1934. F. E. BERTRAND ABRADING MACHINE Filed Sept. 26, 1929 3 Sheets-Sheet 1 aha aw QMN w EN y 1934- F. E. BERTRAND 1,960,327

ABRADING MACHINE Filed Sept. 26, 1929 5 Sheets$heef, 2

y 1934- F. E. BERTRAND 1,960,327

ABRADING MACHINE I Filed Sept. 26, 1929 3 Sheets-Sheet 3 1 'Fig.6. i i I 288 I i V2 86 1 L5;112.; 5-1 :11":1 T L 1 Patented May 29, 1934 UNITED STATES ATE NT "OFFICE 1,960,327 ABRADING MACHINE Application September 26, 1929, Serial No. 395,296

23 Claims.

'This invention relates to abrading machines and is herein shown and described as embodied in-a machine known as a repair outfit and having scouring tools for use upon various portions of 'boots and shoes.

Abrading machines ordinarily are equipped with suction draft systems which include draft hoods in the vicinity of the abrading tools to catch and to conduct away the dust which results from the action of the tools upon the work. In the case of machines having a plurality of abrading tools intended for various purposes, such as repair outfits, it frequently happens that only one tool is in use at a time. The suction draft, however, is distributed among all of the hoods, regardless of the fact that most of the tools may not be in use and that consequently there will be'no dust in the vicinity of the hoods which are associated with the idle tools. The unnecessary distribution of the draft among all of the hoods greatly weakens the force of the draft which otherwise would be availablein the hood associated with a tool actually in use, and involves a waste of power in the driving of a blower for producing the draft, inasmuch as the greater proportion of the power required to drive the'blower goes to produce a draft at points 'wher it is not required.

One-of the objects of the present invention is to overcome the weakening of the draft and the waste of power above-mentioned and to provide for conserving the draft'and concentrating it at the point or points where it is actually required.

In the illustratedmachine, means are provided for controlling the passage of drafts through the various hoods. When any particular tool is to be employed, the operator manipulates the draft-controlling means to effect the passage of a draft through the hood associated with that 40 tool. When,however, the operator desires to pass from the use of the first tool to the use of a different tool, there is ordinarily no longer anyneed of continuing the draft through the hood associated with the first tool. On the contrary, such continuance would serve only to weakenithe draft I through the hood associated with the second tool to be employed, and to result in a waste of power, as above pointed out. With ;a view to avoiding such acondition, and in accordance with the above-stated object, one feature of the inven tion consists in the provision of "draft-controlling means constructed and arranged to turn on a draftthrough any one of the hoodsat the will of the operator, and to stop the draft through that hood upon turning on a draft through any other hood which the operator may later-' des'ire to employ.- The illustrated draft controlling means is also constructed andarranged, upon the intervention of the operator, to continue the "draft through the first hood,=should he so desire,'-during the passage of a draft :later effected through anotherhood.

- Machines of the characterunder consideration usually comprise abrading tools or groups of abrading tools which are driven independently of one another and which have independent drive-controlling means. The illustrated machine has three such independently drivengroups of tools. Two of these groups areprovided with individual draft hoods and with draft-controlling means of the character described in the-foregoing paragraph, the draft-controlling-meansof either group serving automatically to stop adraft through any hood in that group upon effecting a draft through any other hood of that samegroup i which the operator may later desire to employ. However, it is frequently necessary for the operator to pass from the use of a tool of one group to the use of a tool of a different group, and in-such cases the starting ofa draft through the 'hood associated with the tool of the second group will not serve automatically to stop the draft through the hood associated with the last used tool of the first-group. However, in passing from the use of a tool of the firstgroup'to the use of a tool of the second group, the drive of the first group of tools is usually stopped-to prevent waste of power. Whether the drive of a group of tools is stopped for this reason, orbecause the operator is ceasing work altogether with the machine, or whether for any other reason the drive of agroup of tools is stopped, there is no longer any need for a draft through any of the hoods associated with the tools of that group, and thecontinuance of a draftthrough any-of such-hoods would result. in a weakening of the draft ifneeded elsewhere, and many case would result in-a waste of power, as above pointed out. Hence, and in accordance with the abovestated object, a further feature-of the invention consists in the provision of means-actuated b-y the-drive-controllingmeans for any tool for preventing the passage of a draft through the hood associated with that tool upon stopping the drive of that tool. Another object of the invention is to insure that a draft will be available-during the running of any tool or-group of tools. With this object in view, a feature of the invention consists in the provision of *means actuated by the tool-drivecontrolling means, upon starting the drive of any tool or group of tools, for starting the operation of a blower for producing the draft. This feature possesses the additional advantage of enabling the operator to start the drive of the desired tool or group of tools and also of the blower by the movement of a single control handle. It will be noted in the illustrated machine, that while the starting of the drive of any group of tools serves to set the blower into operation, the stopping of the drive of any group of tools does not serve to stop the blower, because a draft may be re quired in the hoods associated with a different group of tools which the operator may be using. Hence, in order to stop the blower during periods wherein none of the tools is to be employed, the illustrated machine is provided with a control for the operation of the blower. It is undesirable, however, to permit the stopping of the blower if the drive of any of the tools is to be continued. Hence, and in accordance with the above stated object, a further feature of the invention consists in the provision of means for preventing the drive of any tool except during the operation of the blower. In the illustrated machine, this feature is carried out by the provision of means actuated by the blower control, upon stopping the operation of the blower, for stopping any tool driving means which may be in operation. The operator is thus enabled conveniently to stop the drive of all of the tools and also of the blower by a simple movement of the blower control handle.

These and other features of the invention including certain details of construction and combinations of parts will be set forth in connection 'with an illustrative machine and will be pointed out in the appended claims.

Referring now to the accompanying drawings,

Fig. 1 is a front elevational View of a repair outfit embodying the present invention;

Fig. 2 is an enlarged fragmentary front elevational View of a portion of the machine shown in Fig. 1;

Fig. 3 is a cross-sectional view of the machine taken ;on the line IIIIII of Fig. 1 and looking in the direction of the arrows;

Fig. 4 is an enlarged end view of a single heelscouring wheel of the machine and its associated dust-catching device; I a Fig. 5 is an enlarged cross-sectional view, taken on the line VV of Fig. 1, of a single bottomscouring roll of the machine and its associated dust-catching device; and

Fig. 6 is a front elevational view of a dust-settling chamber associated with the machine.

The supporting structure of the illustrated machine comprises a plurality of upright frames 10 connected at both their upper and lower portions by tubular cross bars 12. Bearings 14 of the selfaligning type are supported in the lower portion of each of the frames 10, and a drive shaft 16 is journaled in the bearings 14. The shaft 16 is driven by an electric motor (not shown), the control of the driving motor being effected by means of a switch 18 positioned on the upper portion of the frame 10. The usual electrical connections are enclosed in a conduit 20 which leads from the switch 18 to the motor, and which for convenience is threaded through one of the lower tubular cross rods 12. Driving pulleys 22, 24, 26 and 28 are mounted upon the shaft 16 for driving the operative instrumentalities of the machine, presently to be described.

A pair of bottom scouring rolls 30 and 32 provided with relatively coarse and fine abrasive cov'- ers are mounted on a shaft 34, which extends only partially the length of the machine and which is j ournaled in self -aligning bearings 36 supported respectively on the upper portions of a pair of frame members 10. A pulley 33 is mounted on the shaft 34, and a belt 40 running over the pulleys 22 and 38 drives the scouring rolls 30 and 32. Four heel scouring rolls 42, 44, 46 and 48 respectively, designed for operation upon heels of various shapes, and a heel breast scouring roll 50, are mounted on a shaft 52 which extends substantially in line with the shaft 34 partially the length of the machine, and which is journaled in self -aligning bearings 54 supported respectively on the upper portions of a pair of frame members 10. A pulley 56 is mounted on the shaft 52, and a belt 58 (Fig. 2) running over the pulleys 26 and 56 drives the various heel and heel breast scouring tools above mentioned.

A pair of edge trimmers 60 and 62, for removing surplus material from sole edges, are mounted respectively on shafts 64 and 66, both of which shafts are journaled in a head 68 carried upon the top of one of the end frames 10. A pulley 70 is mounted on the shaft 64, and a belt '72 running over the pulleys 28 and T0 drives the shaft 64. A pair of pulleys '74 and 76 are mounted on the shafts 64 and 66 respectively, and a belt '78 running over the pulleys '74 and '76 drives the shaft 66. A grinding wheel 80 is mounted upon one end of the shaft 66 and serves to sharpen the tools 60 and 62 which, when they become dulled, may readily be removed from their shafts and presented to the wheel 80. Associated with the grinding wheel 80 are a guard 84 and a tool rest 86, both supported upon an extension 88 of the head 68. A hand brake 90, which when gripped by the operator exerts a clamping pressure upon the shaft 64, is provided for quickly stopping the rotation of the shaft 64 after the driving connections to the latter have been disconnected. Belt guards 92, supported in the upper portions of frames 10, are provided for the upper portions of the belts 40 and 58 respectively.

In the operation of the above mentioned bottom, heel, and heel breast scouring tools, a considerable volume of dust is given off by the work. Likewise in the operation of the above mentioned edge trimming tools, dust, shavings and small chips are given off. The escape of such waste materials into the atmosphere is undesirable, and for their convenient disposal a suction draft system and a receiving chamber, presently to be described, are provided. A suction manifold 94 is supported by and extends between the upper portions of a pair of frames 10. A blower 96 below the suction manifold 94 and supported by the latter has its intake opening in direct communication with the interior of the suction manifold 94. The blower 96 has a shaft 98 upon which is mounted a pulley 100, and a belt 102 rimning over the pulleys 24 and 100, drives the blower 96. The blower shaft 98 is vertical, while the main driving shaft 16 is horizontal, and an idler pulley 194 is therefore provided for changing the direction of the belt 102. The idler pulley 104 is supported by a bracket 106 secured to the blower 96. The blower 96 has the usual outlet opening, indicated at 108, which is in direct com- .from the work by the action of the various scouring and edge trimming tools above mentioned,

and for conducting such Waste material :to the manifold 94. The devices, now to be described, :for catching the dust :arising from the use of the given off by the heel scouring wheels 44, 46 and 48. It comprises a draft box or inverted draft hood 112, having a pair .of ears 114 which are bored to form sleeves which fit the supporting rod 110, being clamped thereto by set screws 116. The sides and bottom of the draft hood 112 are closed; the rear end communicates with the interior of thesuction manifold 94 by means of a draft pipe 118. The top of the draft hood 112 is provided with .a cover plate 120; and the draft hood 112 is positioned with its top in .a substantially horizontal plane so that the lower segment of the wheel 42 rotates within the draft hood, the cover plate 120 being notched to receive the wheel, 42. The top of the hood 112 is thus effectively closed by the cover plate 120 and by the wheel itself. The forward end of the draft hood 112 is open and is directed to receive the dust stream. A closure plate 122 is provided for closing the forward end of the draft hood 112 to conserve the draft for carrying away dust from other wheels or tools when the wheel 42 is not being used. An advantage of thus positioning the draft closure plate outside of the hood and outside of the draft conduit of which the hood constitutes a part resides in the fact that no opening need be made in the draft conduit to accommodate the draft closure plate or any of its associated mechanism, nor is the conduit partially obstructed when an open draft is desired, as would be the case if any of the draft closure means were positioned within it. Moreover, the positioning of the draft closure means outside of the conduit makes for accessibility. The closure plate 122 (Figs. 2 and 4) at its lower edge is pivotally mounted upon a pin 124 supported by the arms of a yoke 126. A pair of springs 128 tends to urge the draft closure plate 122 in a counterclockwise direction, as viewed in Figs. 3 and 4, about the pivot pin 124. The arms of the yoke 126 are pivotally mounted, respectively, upon pins having heads 12'? (Fig. 4), which pins are secured upon opposite sides of the draft hood 112. A spring 130 (Fig. 2) tends to urge the yoke 126 upwardly or in a counterclockwise direction, as viewed in Figs. 3 and 4. A stop screw 136 (Fig. 2) mounted in a bracket extending from one side of the drafthood 112 engages a notch 138 (Figs. 2 and 4) formed in one of the arms of the yoke 126, the stop screw 136 being adjusted to limit the upward movement of the yoke 126 at a point where the closure plate 122, under the influence of the springs 128, will lie flat against the edges of the opening of the draft hood 112 and thereby prevent any draft from flowing through the draft hood. A tongue 140, formed upon the closure plate 122, extends upwardly when the plate 122 is in draft-closing position and covers the sector of the periphery of the wheel 42 which is ordinarily employed, thereby rendering it necessary for the operator to move the plate 122 to draft-opening position before beginning work with any particular wheel.

A handle 142 fixed upon the cross-bar of the yoke 126 enables the operator to pull the yoke 126 down to open the draft through the draft hood 112, and a latch 144 engagesa pin 146 upon one of the arms of the yoke 126 and holds the yoke 126 down, as shown in Fig. 4, so that .the closure plate 122 cannot obstruct the draft through the draft hood 112.

Each of the heel scouring wheels 42, 44, 46 and 48 has its individual dust-catching device of the character above described, and each dust-catching device has its individual latch 144 for maintaining an open draft passage. There are, therefore, as many latches 144 as there are heel-scouring wheels, and all of the latches 144 are fixed upon a common rock shaft 148 which extends parallel to the scouring wheel shaft 52 and which is mounted in bearings 150 which are supported in the upper portions, respectively, of a pair of frame members 10. Each latch 144 has a cam portion 152 which rides over the pin 146, thereby raising the latch 144 When the handle 142 is pulled down. The cam portion 152 terminates abruptly in a shoulder 154 which serves asa hook for the pin 146, and the combined weight of all i the latches 144 tends to urge them toward latching position, so that when any one handle 142 is rotated far enough in its draft-opening movement, the pin 146 will be carried past the shoulder 154 and the latch 144 will drop into latching position.

The upper and rear sectors of the heel-scouring wheels are not ordinarily employed, and these sectors are therefore protected by guards 156 (Figs. 2 and 4) which are substantially concentric with the scouring wheel shaft 52. Each of the guards 156 covers the periphery of the upper and rear sectors of the wheel with which it is associated and has flanges which extend radially inward and cover a portion of the side faces of the above-mentioned sectors, each guard being mounted upon a pair of pivot pins 158 (Fig. 4) which extend from the respective members of the pair of cars 114 of the hood 112 with which the guard 156 is associated. This pivotal mounting permits the operator to swing back a guard 156 when he replaces the abrasive covering of one of the heel-scouring wheels. As shown in Fig. 4, the heel-scouring wheels are of a well-known type having hinged sectors 160 which are secured enable the operator to accomplish this result by a single movement, a crank arm 164 carrying an outstanding pin 166 at its free end is secured to the yoke 126. The inner edge of one of the flanges of the guard 156 is so formed as to constitute a cam 168 which, supposing the yoke 126 to'be in draft-closing position, will engage the 4 'in Fig. 3, which shows in dotted lines the closed draft position of the crank arms 164 for the wheels 44, 46 and 48. After the abrasive covering i" has been replaced, the guard 156 is swung forward into its normal position which is determined by the end 170 of one of the flanges of the guard, said end functioning as a stop upon engaging the cover plate As the guard 156 swings forwardly, the cam 168 permits the pin 166 to follow it as the yoke 126 is urged by the spring 130 to draft-closing position. In the illustrated machine it has been found unnecessary to connect the interior of the guards 156 with the draft system. The guards 156 do not function, therefore, as draft hoods but as devices for preventing objects from coming into undesired contact with the rotating heel scouring wheels.

A draft hood 172, supported upon the end of the rod 110, catches the dust arising from the use of the heel-breastscouring wheel 50. The hood 172 is connected with the suction draft system through a pipe 174 which leads into a pipe 176, the pipe 176 communicating directly with and constituting an extension of the manifold 94. The draft passage through the hood 172 is relatively small, and no draft closure device for this hood has been provided in the illustrated machine.

Each of the bottom-scouring rolls 30 and 32 (Figs. 1 and 5) is provided with a draft hood 178 (Fig. 5) which surrounds substantially the rear half of its respective roll and has inwardly turned flanges for partially covering the end portions of the roll, and which has a pair of ears 180 bored to form sleeves to receive the rod 110, the ears 180 being clamped to the rod 110 by set screws 182. The draft hoods 178 are connected by a pipe 184 with the manifold 94, the pipe 184 having a branch leading to each of the hoods 178. The bottom edge of each of the hoods 178 is spaced a short distance below the lowermost portion of its respective roll to provide a dust-receiving passage, which passage is closed, when the roll is not in use, by a closure plate 186. The lower edge of each closure plate 186 is pivotally mounted upon a pin 188 supported by the arms of a yoke 190. A pair of springs 192 tends to urge the draft closure plate 186 in a counterclockwise direction, as viewed in Fig. 5, about the pivot pin 188. The arms of the yoke 190 are pivotally mounted upon opposite ends, respectively, of the hood 178 above the shaft 34 by means of pivot pins, the head 189 of one of these pivot pins being shown in Fig. 5. A spring 191 (Fig. 5), which is similar to the spring 130, tends to urge the yoke 190 forwardly or in a counterclockwise direction, as viewed in Fig. 5. A stop screw 196 mounted in one of the arms of the yoke 190 engages a lug 197 formed upon one end of the draft hood, the stop screw 196 being adjusted to limit the forward movement of the yoke 190 at a point where the draft closure plate 186, under the influence of the springs 192, rests flat against the lower edges of the end flanges of the draft hood and substantially closes the dustcatching opening. The cross-bar of the yoke 190 is positioned forwardly of the draft closure plate 186, and, when the yoke 190 is in its forward or draft-closing position, the presence of the crossbar serves to remind the operator to open the draft before using the wheel. A handle 198 formed upon one of the arms of the yoke 190 enables the operator to push the yoke 190 back to open the draft through the hood 178, and a latch 200 engages a pin 262 upon one of the arms of the yoke 190 and holds the yoke 190 back so that the closure plate 186 cannot obstruct the draft through the hood 178. Each of the dust-catching devices associated with the bottom-scouring rolls 30 and 32 has its individual latch 280, and both of the latches 200 are similar to the latches 144 and are fixed upon a common rock shaft 204 which extends parallel to the bottom-scouring roll shaft 32 and which is journaled in the upper portions, respectively, of a pair of frames 10.

The upper edge of each of the hoods 178- is spaced 2, short distance above the uppermost portion of its respective roll, and the intervening space is normally closed by a plate 206 carried by a member 208 which is hinged upon the upper portion of the hood 178 and which has a handle 210 whereby the plate 206 may be swung back to afford access to the roll 30 or 32 when it becomes necessary to replace the abrasive covering thereof. The member 208 has formed upon one end a cam 212, and the yoke 190 has a crank arm 214 carrying a pin 216 which is engaged by the cam 212 to rock the yoke 190 back when the plate 206 is swung back, so that both of the plates 206 and 186 may be moved to an out-of-the-way position by a single movement on the part of the operator when he desires to replace the abrasive covering upon one of the rolls 30 or 32.

The edge-trimming tools 60 and 62 are provided with a common draft hood 218 having a window 220 therein. The rear lower portion of the hood 218 communicates directly with the suction draft pipe 1'76 through a narrow slot which may be closed, when the edge-trimming tools are not in use, by a, closure plate 222. The closure plate 222 has a pair of arms 224 which extend forwardly and which are pivotally mounted at 226 in the forward portions respectively of the side walls of the hood 218. The closure plate 222 is moved upwardly to open the draft and downwardly to close the draft by instrumentalities later to be described.

Control levers 228, 230, 232 and 234 are provided for shifting the belts 40, 102, 58 and 72 respectively. Each of the above-mentioned control levers 228, 230 and 232 has a bracket 236 adjustably mounted upon its lower end, and each of the brackets 236 carries a pair of staggered fingers 238 which straddle a belt. The

control lever 234 carries upon its lower end a member 240 having an offset portion which engages one edge of the belt 72 and having two pins 242 which engage the opposite edge. Each of the above-mentioned control levers has a handle 244 and is journaled at 246 in a bracket (or lug, in'the case of the lever 234) extending from one of the frames 10. The above-mentioned rackets each carries a plate 245 (Fig. 2) having an arcuate slot into which extends a pin 24'? secured to the corresponding lever for limiting the throw of the lever. A compression spring 249 (Fig. 3) interposed between each lever and a collar upon the end of the corresponding pin 247 urges the lever against the plate 245 and causes sufficient friction to prevent accidental shifting of the lever.

In shifting the belts 40, 102, 58 and 72 from their drive pulleys 22, 24, 26 and 28 respectively, the belts are transferred not to the usual idler pulleys but to devices each comprising a plural- 5 ed in radial slots 252 (Fig. 3) in arms of the I brackets 248 so that the members 250 lie wholly within a circumference equal to that of the small end of the adjacent coned drive pulley. The fingers of each of the devices associated with the relatively small drive pulleys 24 and 26 are three dependent.

in number. The above -describeddevice presents ing position will rock the shaft 148 to elevatethe advantages over the hithertov used idler'pulley ofbeinglighter in weight and more economical to manufacture. The fingersassociated' with the pulley 26 consist ofhard maple conical frusta 254 saturated with grease or oil to be self-lubricating and rotatably mounted upon pins which are adjustably mounted. in the slots 252 so that I the small ends of the conical frustra' 254 lie wholly within a circumference equal to that of the small end of the adjacent coned drive pulley. A particular advantage of employing. 'coned fingers resides'in the fact that the belt tends torun up the conical surfaceathereby' facilitating its transfer and also tensioning it and thusexerting a braking effect.

For purposes which presently will be made apparent, the control of the drive to the various tool shafts 34, 52 and 64, the control of. the blower 96, and the control of the. various draft closure devices above described, are made inter A. control rod 256 extends the full length of the machine and is supported for longitudinal movement in. the frames 10;. As shown in Fig. 1, and more particularly in Figs. 2' and 3, a collar having a lug 258' is secured: to the rod 256 in such a position that movement of the control lever 232 to shift the belt 58 into driving engagement with the pulley 26 will cause the lever 232 to engage the lug 258 and thereby to move the rod 256 toward the right, as viewed:

in Figs. 1 and 2, unless it so happens that the rod 256 is already at the right-hand limit of its range of movement. Likewise; movement of the rod 256 toward the left will cause the lug 258 to engage the lever 232 and shift the belt 58 from operative engagement with the pulley 26, unless it so happens that the belt 58 already has been thus shifted. A collar hav-' ing a lug 260 (Fig. 1) is similarlymountedon the rod 256 with respect'to-the lever 228, and acollar 262 is so mounted on. the rod 256 as directly to be engaged by an arm 264 of the lever 234 when the latter is shifted to driving position and thereby to move the rod 256 towardthe right, unless it so happens that the rod 256 is already at the right-hand limit of its range of movement; Likewise, movement. of the rod 256 toward the left will cause the collar 262 to engage the arm 264 and shift the lever 234 to non-driving position, unless it so happens that the lever 234 already is in suchposition. A oollar having a pair of lugs 266 (Fig. 1) which straddle the blower control lever 230 is secured upon the rod 256, so-that movement of the lever 230 to start the blower will always shift the rod 256 toward the right, and movement of the lever 230 to stop the blower will always shift the rod 256 toward the left. Likewise, movement of the rod 256 toward the right will always start the blower, and movement of the rod 256 toward the left will always stop the blower.

As shown in Fig. 1, and more particularly in Figs. 2 and 3, a bell crank lever-268 is fulcrum'ed upon one of the frames 10 in such a manner that A crank arm 270 (Fig. 4) is all of the latches 144, thereby releasing any of the pins 146 which may be latched and thereby permitting any of the closure plates122 to close.

A pin 2'74 on a third arm ofthe bell crank lever 268 engages an edge of the adjacent frame 10 and thereby determines the normal position of. the latches 144. A bell crank lever 276, similar to the bell crank lever 268, is mounted onthe left-hand frame 16' in a similar relation tothe lover 228 and to the rock shaft 204, to which it is connected by a rod 2'78 and a crank arm, so

ly to the hub of the lever 234-, so-that when the lever 234 is shifted to driving position, the closure plate 222' will be raised to open the draft through the hood 218, andwhen the lever 234 is shifted to non-driving position, the closure plate 222 will be lowered to out off the draft through the hood 21-8.

A dust-receiving chamber 282 (Fig. 1- and more particularly Fig. 6) has an inlet opening 284 whichis in direct communication With the outlet 1080f the blower 96 and which receives dust-laden air directly therefrom. The chamber 282 has a pair of outlet openings across which extend" screens-286, the outlet openings being at oppositeends ofthe chamber 282 and'on opposite sides of and positioned above the level of the inlet opening 284. Each outlet opening communicates with the atmosphere through a short chimney 288, which may be filledwith oil-soaked steel wool tocatch any fine dust particles=which= have not settled within the chamber282. The bottom290 of the chamber 282 is in the form of an the ends of the chamber 282 and which normally are closed by: dust-receiving drawers 292, respectively. Because of'the fact that the two outlet openings, which are disposedon opposite sides of the inlet opening, are of equal'area, the draft through the chamber will be divided into two parts,'each of which will travel with only half the velocity as-would be the caseif one of the out-- letopenings were closed so-that the entiredraft traveled in the same'direction. Because of the retardation in the velocity of the draft, dust will be precipitated and will fall either directly into the drawers 292 or else upon the sloping bottom 290 whence it will be conducted, under the influence-of gravity and of the force of the draft, to the drawers 292.

The machine is provided withscreens 296, one

of which is shown in Fig. 1', to protectpersons' in the rear from accidental contactwith the driving mechanism, and with a shelf 298 carried by. uprights 300 which are supported-by the frames 10 In operating the machine, the handle 244: of one of the control levers 228, 232 or 234 is first moved to the right, as viewed in Fig. 1. movement shifts the appropriate belt into engagement with its driving pulley, thereby start-- ing the rotation of the bottom-scouring rolls 30 This and 32; or of the heel and heel-breast-scouring rolls42', 44',- 46, 48 and 50, or of the edge-trim ming tools 60 and 62, as the case may be. The same movement of the control lever also shifts the rod 256 to the right and thereby starts the operation of the blower 96. Supposing it to be the heel-scouring wheels which have been started rotating, the operator proceeds to latch back the draft closure plate 122 associated with the particular wheel which he desires to use, thereby turning on the draft throughthe hood associated with that particular wheel. If, after having employed one of the heel-scouring wheels, the conditions'of the work require the use of a heelscouring wheel of a different contour, the operator merely latches back the draft closure plate 122 associated with the second heel-scouring Wheel. The latching of the second draft closure plate raises the second latch 144, because of the action of the pin 146 upon the cam 152, and the raising of the second latch 144 rocks the shaft 148 and raises the first latch 144, therebyreleasing the first draft closure plate. The latching in open position of any one of the four draft closure plates thus automatically effects the closing of any other draft closure plate which may be open, causing the draft through any other hood to be turned off. It is possible, however, if more than one man wishes to use the machine at the same time, to latch back two or more of the closure plates 122, and this is accomplished very easily merely by pushing back and then holding back the yokes 126 associated with the various wheels which it is desired to use until all of the yokes thus held back are latched. Supposing, now, the operator wishes to pass from the heel-scouring wheels to the bottom-scouring rolls 30 and 32. He may then permit the heel-scouring wheels to continue to rotate, or he may shift the handle 244 of the lever 232 toward the left and thereby transfer the belt 58 from engagement with the driving pulley 26. The same movement of the lever 232 will rock the bell crank 268 and thereby rock the latches 144 to release any of the draft closure plates which may be latched in open position. In moving the lever 232 to the left, the lever merely backs away from the lug 258, and no movement of the rod 256 is effected. The blower 96, therefore, continues to run. The operator then shifts the handle 244 of the control lever 228 to the right, thereby transferring the belt 40 into engagement with the driving pulley 22 and starting rotation of the shaft 34. The latching in open position of either of the draft closure plates 186 serves to release the other if the other has been left open, although both closure plates 186 may be latched open in the same manner as has already been described in reference to the latching open of a plurality of the closure plates 122. If now the operator wishes to pass from the bottom-scouring rolls to the edge-trimming tools 60 and 62, he may permit the bottom-scouring rolls to rotate or he may shift the lever 228 toward the left, thereby stopping the drive to the shaft 34, and this movement of the lever 228 at the same time rocks the bell crank lever 2'76 to release any draft closure plate 186 which might have been left latched open. He then shifts the handle 244 of the lever 234 to the right, which transfers the belt 72 into driving engagement with the pulley 28 and starts rotation of the tools 60 and 62. The same movement of the lever 234 serves to raise the draft closure plate 222 to open position. When the use of the machine is not desired for an appreciable length of time, the operator shifts the handle 244 of the lever 230 to the left, thereby stopping the blower 96 and also, through the rod 256 and the levers 228, 232 and 234, stopping the drive to any shafts which may still be rotating. It has already been pointed out that movement of any of the levers 228, 232 and 234 to non-driving position will also effect the closure of the draft control plates of the hoods associated with the group of tools the drive of which is controlled by that particular lever. Since, therefore, the stopping of the blower results in stopping the drive to all of the tools, it will also result in closing any of the draft closure plates which may still be open. An advantage of thus closing the draft closure plates resides in the fact that when the blower is again started no draft closure plate will unnecessarily remain open and thus waste the draft. It will be noted that the starting of any unit of the machine will automatically set the blower into operation, and that the stopping of the blower will automatically stop the operation of every unit which may be running and also effect the shutting off of every draft which may be open.

Having described the invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A suction draft system comprising a plurality of draft hoods, control means for starting and stopping the passage of a draft through each of said hoods, and means actuated by said control means and constructed and arranged, upon the operation of said control means in starting the passage of a draft through any of said hoods, to cause said control means to stop the passage of a draft through each of the other hoods.

2. A suction draft system comprising a plurality of draft hoods, means for controlling the passage of a draft through said hoods constructed and arranged to turn on a draft through any one of said hoods at the will of the operator, and means operable by said control means upon turning on a draft through any other hood to cause said control means to turn off the draft through said one hood.

3. A suction draft system comprising a plurality of draft hoods, means for controlling the passage of a draft through said hoods constructed and arranged to turn on a draft through any one of said hoods at the will of the operator, and means automatically operable by said controlling means upon turning on a draft through any one of said hoods to cause said controlling means to turn off any other draft which may previously have been turned on and which continues to flow through any other hood.

4. A suction draft system comprising a plurality of draft hoods, means for turning on a draft through any one of said hoods at the will of the operator, and means associated with said turning-on means for automatically causing the turning off of the draft through said one hood upon turning on a draft through any other hood which the operator may later desire to employ.

5. A suction draft system comprising a plurality of draft hoods, means for controlling the passage of a draft through said hoods constructed and arranged to turn on a draft through one or more hoods at the will of the operator, and means actuated by said control means to cause said control means to turn off the draft through said one or more hoods upon the turning on of a draft through any other hood which the operator may later desire to employ.

6. A suction draft system comprising a plurality of draft hoods, means for controlling the passage of a draft through said hoods constructed Cit and arranged to turn on a draft through any one of said hoods at the will of the operator and means automatically operable by said controlling means to cause said controlling means-to turn off the draft through said one hood upon the turning on of a draft through any other hood which the operator may later desire to employ, said draft-controlling means being also constructed and arranged upon the intervention of the oper ator to continue the draft through said one hood during the passage of a draft later turned on through another draft hood.

7. A suction draft system comprising a plurality of draft hoods, suction conduits connected to each of said hoods respectively, a draft closure device movable to open or to close a draft through each of said hoods respectively, and means actuated by each of said closure devices upon a draftopening movement for closing any other closure device which may be open.

8. An abrading machine comprising a plurality of abrading tools, draft hoods for eachof said tools respectively, means tending normally to effect closure of said draft hoods to obstruct drafts therethrough, and means for maintaining said drafthoods open to permit drafts to flow through said hoods, the last said means being constructed and arranged upon the opening of any one of said draft hoods to actuate said closure-effecting means to close any other drafthood which may be open.

9. An abrading machine comprising a plurality of abrading tools, draft hoods for said tools respectively, means for closing said draft hoods to obstruct drafts therethrough, m ans for normally urging said closing means to closing position, and means for latching said closing means in position to maintain said draft hoods open to permit drafts to flow therethrough, said latching means being constructed and arranged upon the opening of any one draft hood to release said closing means to permit closure of any other draft hood which may be open.

10. An abrading machine comprising a plurality of abrading tools, driving means for said tools, controlling means for said driving means for starting and stopping the drive of said tools independently of one another, a suction draft system for all of said tools including a draft hood associated with each of said tools, and means actuated by said controlling means for preventing the passage of a draft through the hood associated with any of said tools upon stopping the drive of that tool.

11. An abrading machine comprising a plurality of groups of abrading tools, driving means for said groups of tools, controlling means for said driving means for starting and stopping the drive of said groups independently of one another, a suction draft system for all of said tools including a draft hood associated with each of said tools, and means actuated by said controlling means upon stopping the drive of any group of tools for preventing the passage of a draft through the hood associated with any tool of that group.

12. An abrading machine comprising a plurality of abrading tools, driving means for said tools, controlling means for said driving means for starting and stopping the drive of said tools independently of one another, a suction draft system for all of said tools including a draft hood associated with each of said tools, a draft closure plate for stopping the draft through each of said hoods, and connections between said controlling means' and said draft closure plates: con:- structed and arranged upon the stopping of the drive of any tool to close the closure plate of the hood associated with that tool.

13. An abrading machine comprising a plurality of abrading tools, driving means for said tools, control means for said driving means for starting and stopping the drive of said too1sindependently of one another, a suction draft system including ablower for removing dust given oif by the action of said tools upon the work, and means actuated by said drive control means upon starting the drive of any toolfor starting the operation of said blower.

14.An abrading machine comprising a. plurality of abrading tools, driving means for said tools, means for driving said tools independently of one another, a suction draft system including a blower for removing dust given off by the actionof said tools upon the work, means'for controlling the operation of said blower, and means subject to the control of said blower-controlling means for preventing the drive of any of said tools except during the operation of said blower.

15. An abrading machine comprising a plurality o-f abrading tools, means for. driving said tools independently of one another, a suction draft system including a blower for removing dust given off by the action of said tools upon the work, nieans for controlling the operation of said blower, and meansactuated by said blowercontrolling means upon stopping the operation of said blower for stopping any of said tool-driving means which may be in operation.

16. An abrading machine comprising a plurality of abrading tools, driving means for. said tools, control means for said driving means for starting and stopping the drive of said tools independently of one another, a suction draft system including a blower for removing dust given off by the action of said tools upon the work, driving means for said blower, control means for starting and stopping the drive of said blower, and connections between said tool drive control means and said blower drive control means constructed and arranged to cause the starting of said blower-driving means upon the starting of any tool-driving means, and to cause the stopping of any tool-driving means upon the stopping of said blower-driving means.

17. An abrading machine comprising a plurality of abrading tools, a suction draft system including a plurality of draft hoods associated with said tools respectively and a blower for removing dust given off by the action of said tools upon the work, a draft closure device for preventing the passage of a draft through each of said hoods, means for opening each of said draft closure devices independently of the others, driving means for said blower, control means for starting and stopping the drive of said blower, and means associated with said blower control means for closing any of said draft closure devices which might be open upon the stopping of said blower.

18. An abrading machine comprising an abrading tool, a draft hood surrounding a portion of said tool and terminating in an opening adjacent to the Working surface of said tool for catching dust given off by the action of said tool upon the work, a movable draft closure plate positioned outside of said hood and constructed and arranged to cover said opening of said hood to obstruct the passage of a draft therethrough, means for normally urging said draft closure plate to closed position, and means for latching said draft closure plate in open position.

19. An abrading machine comprising a rotary abrading tool, a draft hood associated with said tool for catching dust given off by the action of said tool upon the work, and a movable drift closure plate for shutting off a draft through said hood, said draft closure plate having an arcuate tongue adapted to fit part way around the periphery of said abrading tool to block access to the tool when the draft closure plate is in draftclosing position, thereby rendering necessary the opening of said draft closure plate before the tool can be used.

'20. An abrading machine comprising an abrad ing tool, a draft hood associated with said tool for catching dust given off by the action of said tool upon the work, draft closure means for shutting off a draft through said hood, said draft closure means being constructed and arranged when in draft-closing position to block access to said tool, a guard partially enclosing said tool and mounted for movement away from said tool, and connecting means between said guard and said draft closure means constructed and arranged to move said draft closure means away from said tool upon movement of said guard away from said tool to permit access to said tool.

21. A suction draft system comprising a plurality of draft hoods, means associated with each of said hoods for controlling the passage of a draft through that hood, each of said control means being constructed and arranged normally to close a draft through its respective hood and being movable at the will of the operator to turn on a draft through its respective hood, means for holding said control means in turned-on position, and connecting means between said control means constructed and arranged upon a draftopening movement of any one of said control means to release from said holding means the control means for each of the other hoods, thereby enabling tiie control means for each of the other hoods, in the absence of intervention by,

the operator, to return to normal closed-draft position.

22. A suction draft system comprising a plurality of draft hoods, an individual draft control means associated with each hood, each of said control means being movable at the will of the operator to permit the passage of a draft through the hood with which it is associated, means for moving each of said control means to closeddraft position, and means operable by any one or more of said control means upon movement to draft-permitting position to actuate said moving means to move the control means associated with each of the other hoods to closed-draft position.

23. An abrading machine comprising a plurality of abrading tools, a draft hood associated with each of said abrading tools, a draft closure plate for each of said hoods, means for urging each of said draft closure plates to draft-closing position, a latch associated with each of said draft closure plates for maintaining its respective draft closure plate in open position, and a common rocker arm upon which all of said latches are mounted, whereby the latching movement of any one of said latches will rock said rocker arm to release any other of said latches to permit the return to draft-closing position of any draft closure plate which may be held open by the other of said latches.

FREDERIC E. BERTRAND. 

